表底孔联合消力池三维流场数值模拟研究

3D numerical simulation study on flow field in compound stilling basin of surface and bottom outlet

基于RNGk-ε紊流模型,针对消力池内纵向隔墩对比研究了常规隔墩式消力池与表底孔联合消力池三维流场的差异.数值模拟计算结果表明：拆除消力池内纵向隔墩有助于表底孔联合消力池利用表孔与底孔入池水流差异,使其在消力池上游区域激起强烈横向扩散和碰撞,形成由底至表不断发展的立轴旋滚,显著增强消力池内相邻水股剪切紊动耗散,尤其当底孔单独运行时消力池内过流宽度突变使入池水流形成显著三维水跃,沿程平均流速下降35%-49%,从而改善消力池内水流流态,取得较好的消能效果.

Based on RNG k-ε turbulent model,aiming at longitudinal pier,the conventional stilling basin and the compound stilling basin was studied to reveal the three dimensional（3 D） flow field difference.Numerical simulation results show that compared to the conventional stilling basin,the compound stilling basin without longitudinal pier can utilize the difference among the running inflow from the bottom and the surface outlet and force each flow to laterally offset or collide in the upstream region of the stilling basin,forming observably vertical vortex and significantly intensifying mutual shear turbulence.Under the condition of bottom outlet running alone,it＇s more remarkable that the running inflow would swiftly transforms into 3 D hydraulic jump in view of the sudden expansion section,and the flow pattern is observably improved with the velocity decreased by 35%-49%,achieving excellent results.